Can't create fragment

[pc386]

After upgrading ember/data to 3.12, I am getting this error Uncaught Error: Either an id or a clientId is required as an argument when I try to create a fragment like this store.createFragment('content-conditions-group', { conditionType, content, });

conditionType and content are belongsTo relationships in my fragment. Creating an empty fragment works, but if I try to set the content after creating, I get the same error.

Stack trace:
Uncaught Error: Either an id or a clientId is required as an argument. at RecordDataStoreWrapper.notifyBelongsToChange (-private.js:7291) at BelongsToRelationship.notifyBelongsToChange (-private.js:9747) at BelongsToRelationship.addRecordData (-private.js:9725) at BelongsToRelationship.setRecordData (-private.js:9623) at RecordDataDefault.setDirtyBelongsTo (-private.js:10257) at InternalModel.setDirtyBelongsTo (-private.js:4706) at Class.set (-private.js:323) at ComputedProperty._set (metal.js:3615) at ComputedProperty.setWithSuspend (metal.js:3592) at ComputedProperty.set (metal.js:3563)